Consider a Stored Procedure with the following definition:
CREATE OR REPLACE PROCEDURE proc1 (IN p2 VARCHAR(20))
BEGIN
…
END
@
Using DB2 CLP, which of the following commands would successfully execute procedure
PROC1?

A.
CALL proc1(DEFAULT)

B.
CALL proc1(?)

C.
CALL proc1(NULL)

D.
None of the above

Explanation: